ABSTRACT

Lactobacillus bulgaricus, Streptococcus thermophilusand Lactobacillus fermentumisolated from fermentedfoods: yoghurt, “ugba” and “kunu-zaki” using MRS agar and a commercially acquired lactic acid bacteria (LAB) were used to produce yoghurts samples A-H from Milksi Powered milk in a 5 hour fermentation process. The three LAB isolates were used singly and in combinations as starter cultures. There was a maximum drop in pH (4-4.8) between the second and third hour of fermentation while the yoghurt produced using S. thermophilushad the lowest pH (5.2) at the temperature of 40oC. The optimum pH for the yoghurt production was 5.5 while the optimum temperature was 40oC. Yoghurt samples B and F had the highest moisture level (P<0.05) while Samples C, E and G had the highest dry matter content. The highest ash content (0.8 ±0.01; P<0.05) was from sample F while Samples D and E had the highest crude fibre content. Sample A had the highest crude fat value (3.95a±0.01; P<0.05), Sample F the highest crude protein content (3.95a±0.01; P<0.05) while the highest carbohydrate content was from Samples C, E, G and H (control). The control Sample (H) had the highest and Hedonic test for sensory properties of the eight yoghurt samples showed that the eight yoghurt samples were acceptable to the panelist indicating that the samples would compete favourably in the market with commercially sold yoghurts.